Yes Sir. Our names as Parents on her passport now. Is it an issue while filing for international study permit?
It's really impossible for any of us to say. You'll have to try and see what happens. You should be careful in how you explain your relationship to the child. I would include an LOE explaining that while your names appear as her parents on the passport, that at least one of her parents is still alive. You don't want to end up in a situation where IRCC says you have misrepresented the situation and circumstances.
You'll need to get a local school to accept her first. Once that's done, you'll need to apply for the study permit. As part of this application, you will need to include a bank statement showing at least $25,000 in savings to cover living expenses and tuition. You should expect that tuition will cost $15,000 per year for public school (more for private).
Good luck with the application.